... and it doesn't even have to be the same card. All the major card makers do also make cards to a certain OEM's specifications - which oftentimes means making a downspecced card for cost reasons, still with the same moniker. You'd expect these to end up in the OEM's brand boxes only, however when there's surplus, you'll find them on retail shelves too.
The rule is to find the exact specifications of the retail product, and comparing with the OEM gear you're offered. Then make your decision.